Every now and then after the car is warm I start the car up and in about 1 second the engine will stall and quit. I let it sit for 15-30 seconds and it will start up and run perfect. once it dose get running it dosent have any problems even at idle. Any ideas on what is causing this. It first started at the track. I was running 30% ethonal. I originaly thought they ethonal might be doing it but now i am on a new tank and it is still doing it. I checked the fuel filter and gas is flowing through it very nicly. This is my first tank after i ran my ethonal tank to empty. I was thinking maybe it was the fuel pump was going out. Any ideas on what this could be. Also if it is the fuel pump what would one of those puppys cost me? thank you so much.